update

misc/build.bat

@@ -16,8 +16,8 @@ set commonCompilerFlags=^
 
 pushd .\build
 
-cl %commonCompilerFlags% -Fe:handmade.dll ..\src\handmade.cpp -Fmhandmade.map /link /DLL /EXPORT:gameGetSoundSamples /EXPORT:gameUpdateAndRender
-cl %commonCompilerFlags% -Fe:handmade_win32.exe ..\src\win32_handmade.cpp -Fmwin32_handmade.map /link %commonLinkerFlags%
+cl %commonCompilerFlags% ..\src\handmade.cpp -Fmhandmade.map -LD /link -incremental:no -EXPORT:gameGetSoundSamples -EXPORT:gameUpdateAndRender
+cl %commonCompilerFlags% -Fe:handmade_win32.exe ..\src\win32_handmade.cpp -Fmwin32_handmade.map /link -incremental:no %commonLinkerFlags%
 popd
 exit /b
 

src/handmade.cpp

@@ -24,7 +24,7 @@ internal void renderWeirdGradient(GameOffscreenBuffer *buffer, int xOffset, int
         for (int x = 0; x < buffer->width; x++) {
             uint8 blue = (uint8)(x + xOffset);
             uint8 green = (uint8)(y + yOffset);
-            *pixel++ = (green << 16) | blue;
+            *pixel++ = (green << 8) | blue;
         }
         row += pitch;
     }
@@ -77,11 +77,3 @@ extern "C" GAME_UPDATE_AND_RENDER(gameUpdateAndRender) {
 extern "C" GAME_GET_SOUND_SAMPLES(gameGetSoundSamples) {
     outputSineSound(soundBuf, (GameState*)memory->permanentStorage);
 }
-
-#if HANDMADE_WIN32
-#include "windows.h"
-
-BOOL DllMain() {
-    return TRUE;
-}
-#endif

src/win32_handmade.cpp

@@ -143,13 +143,27 @@ struct Win32GameCode {
     GameUpdateAndRenderFn *updateAndRender;
     GameGetSoundSamplesFn *getSoundSamples;
     bool isValid;
+    FILETIME lastWriteTime;
 };
 
-internal Win32GameCode win32LoadGameCode() {
+inline FILETIME win32GetLastWriteTime(char *filename) {
+    FILETIME lastWriteTime = {};
+    WIN32_FIND_DATA findData;
+    HANDLE findHandle = FindFirstFileA(filename, &findData);
+    if (findHandle != INVALID_HANDLE_VALUE) {
+        lastWriteTime = findData.ftLastWriteTime;
+        FindClose(findHandle);
+    }
+    return lastWriteTime;
+}
+
+internal Win32GameCode win32LoadGameCode(char *filename, char *tempname) {
     Win32GameCode result = {};
 
-    CopyFile("handmade.dll", "handmade_temp.dll", FALSE);
-    HMODULE gameCodeLib = LoadLibrary("handmade_temp.dll");
+    result.lastWriteTime = win32GetLastWriteTime(filename);
+
+    CopyFile(filename, tempname, FALSE);
+    HMODULE gameCodeLib = LoadLibrary(tempname);
     result.gameCodeLib = gameCodeLib;
 
     if (gameCodeLib) {
@@ -453,7 +467,38 @@ internal void win32DebugSyncDisplay(Win32OffscreenBuffer *screenBuffer, int mark
     }
 }
 
+void catStrings(size_t sourceACount, char *sourceA, size_t sourceBCount, char *sourceB, size_t destCount, char *dest) {
+    for (int i = 0; i < sourceACount; i++) { 
+        *dest++ = *sourceA++;
+    }
+    for (int i = 0; i < sourceBCount; i++) { 
+        *dest++ = *sourceB++;
+    }
+    *dest++ = 0;
+}
+
 int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLine, int commandShow) {
+    char exeFileName[MAX_PATH];
+    DWORD sizeOfFilename = GetModuleFileNameA(NULL, exeFileName, sizeof(exeFileName));
+    char *onePastLastSlash = exeFileName;
+    for (char *scan = exeFileName; *scan; scan++) {
+        if (*scan == '\\') {
+            onePastLastSlash = scan + 1;
+        }
+    }
+
+    char sourceGameCodeDLLFilename[] = "handmade.dll";
+    char sourceGameCodeDLLFullPath[MAX_PATH];
+    catStrings(onePastLastSlash - exeFileName, exeFileName, 
+            sizeof(sourceGameCodeDLLFilename) - 1, sourceGameCodeDLLFilename,
+            sizeof(sourceGameCodeDLLFullPath) - 1, sourceGameCodeDLLFullPath);
+
+    char tempGameCodeDLLFilename[] = "handmade_temp.dll";
+    char tempGameCodeDLLFullPath[MAX_PATH];
+    catStrings(onePastLastSlash - exeFileName, exeFileName, 
+            sizeof(tempGameCodeDLLFilename) - 1, tempGameCodeDLLFilename,
+            sizeof(tempGameCodeDLLFullPath) - 1, tempGameCodeDLLFullPath);
+
     LARGE_INTEGER performanceFrequencyResult;
     QueryPerformanceFrequency(&performanceFrequencyResult);
     globalPerfCountFrequency = performanceFrequencyResult.QuadPart;
@@ -506,7 +551,7 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             soundOutput.runningSampleIndex = 0;
             soundOutput.bytesPerSample = sizeof(int16)*2;
             soundOutput.secondaryBufferSize = soundOutput.samplesPerSecond*soundOutput.bytesPerSample;
-            soundOutput.safetyBytes = (soundOutput.samplesPerSecond * soundOutput.bytesPerSample / gameUpdateHz) / 3;
+            soundOutput.safetyBytes = (soundOutput.samplesPerSecond * soundOutput.bytesPerSample / gameUpdateHz) / 2;
 
             int16 *samples = (int16*)VirtualAlloc(NULL, soundOutput.secondaryBufferSize, MEM_COMMIT, PAGE_READWRITE);
 
@@ -539,16 +584,14 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             real32 audioLatencySeconds = 0;
             bool soundIsValid = false;
 
-            Win32GameCode game = win32LoadGameCode();
-            uint32 loadCounter = 0;
+            Win32GameCode game = win32LoadGameCode(sourceGameCodeDLLFullPath, tempGameCodeDLLFullPath);
 
             int64 lastCycleCount = __rdtsc();
             while (globalRunning) {
-                if (loadCounter++ > 60) {
+                FILETIME newWriteTime = win32GetLastWriteTime(sourceGameCodeDLLFullPath);
+                if (CompareFileTime(&newWriteTime, &game.lastWriteTime) != 0) {
                     win32UnloadGameCode(&game);
-                    game = win32LoadGameCode();
-                    loadCounter = 0;
-                    // TODO(dledda): handmade hero episode 22 (from the beginning)
+                    game = win32LoadGameCode(sourceGameCodeDLLFullPath, tempGameCodeDLLFullPath);
                 }
 
                 GameControllerInput *oldKeyboardController = &oldInput->controllers[0];